Magento® 2 module force login customers

1. Go to Magento® 2 root directory

2. Enter following commands to install module:

   composer require maxmage/forcelogin
   

   Wait while dependencies are updated.

3. Enter following commands to enable module:

   php bin/magento module:enable MaxMage_ForceLogin
   php bin/magento setup:upgrade
   php bin/magento cache:clean
   

5. Enable the Force Login module in Magento® Admin under Stores > Configuration > Customers > Force Login.